Operator-visible warning symbol on a coupler



FIG. 1 is a left perspective view of an operator visible warning symbol on a coupler showing my new design, the earth moving machine shown in broken line is for environmental purposes only and forms no part of the claimed design;

FIG. 2 is a right perspective view thereof;

FIG. 3 is an enlarged perspective view thereof;

FIG. 4 is a top perspective view thereof;

FIG. 5 is a side view thereof;

FIG. 6 is a bottom perspective view thereof; and,

FIG. 7 is a front view thereof.

The broken lines are only for illustrative purposes to show visible environmental structure and form no part of the claimed invention. 

I claim the ornamental design for a “operator-visible warning symbol on a coupler,” as shown and described. 